Electronic-device seal structure and electromagnetic relay using said electronic-device seal structure

Abstract

An electronic-device seal structure includes a base, a case which covers an upper surface of the base and has an opening at a surface thereof, and a pair of terminals attached to the base. A first clearance sealed with a sealing material is provided between the base and the case, and a second clearance is provided between the pair of terminals attached to an end surface of the base to face each other.

The invention claimed is: 
     
       1. An electronic-device seal structure, comprising:
 a base; 
 a case which covers an upper surface of the base and has an opening at a surface thereof; and 
 a terminal, which is attached to the base, having a body and a pair of terminal parts at one end of the body, wherein 
 a seal is formed between the base and the case, 
 a clearance is provided between the pair of terminal parts disposed on an end surface of the base to face each other and is surrounded by the pair of terminal parts, the body of the terminal, and the case, 
 clearance forming portions, which form the clearance and are provided on bases of the pair of terminal parts to face each other, 
 a dimension from the body of each of the pair of terminal parts to an inner surface of the case is not smaller than 0.16 mm and not larger than 0.25 mm, 
 the clearance between the clearance forming portions is not larger than 2.0 mm, and 
 a longitudinal dimension of a facing portion of each of the clearance forming portions is not larger than 2.1 mm, and the seal is formed by a material having a viscosity of 39000 to 48000 mPa·s in a range of 25±5° C. 
 
     
     
       2. The electronic-device seal structure as claimed in  claim 1 , wherein
 each of the pair of terminal parts is a laminate configured by folding and superimposing a plate-like member. 
 
     
     
       3. The electronic-device seal structure as claimed in  claim 1 , wherein
 the clearance between the pair of terminal parts is not larger than 0.5 mm. 
 
     
     
       4. The electronic-device seal structure as claimed in  claim 1 , wherein
 the electronic-device seal structure further comprises tapered portions, provided at facing edges of the pair of terminal parts. 
 
     
     
       5. The electronic-device seal structure as claimed in  claim 4 , wherein
 an angle of each of the tapered portions is not smaller than 20°. 
 
     
     
       6. An electromagnetic relay, comprising:
 an electronic-device seal structure claimed in  claim 1 . 
 
     
     
       7. An electronic-device seal structure, comprising:
 a base; 
 a case which covers an upper surface of the base and has an opening at a surface thereof; and 
 a pair of terminals attached to the base, wherein 
 a first clearance sealed with a sealing material is provided between the base and the case, 
 a second clearance is provided between the pair of terminals disposed on an end surface of the base to face each other, 
 clearance forming portions, which form the second clearance and are provided on bases of the pair of terminals to face each other, 
 a dimension from a body of each of the pair of terminals to an inner surface of the case is not smaller than 0.16 mm and not larger than 0.25 mm, 
 the second clearance between the clearance forming portions is not larger than 2.0 mm, and 
 a longitudinal dimension of a facing portion of each of the clearance forming portions is not larger than 2.1 mm, and the sealing material has a viscosity of 39000 to 48000 mPa·s in a range of 25±5° C. 
 
     
     
       8. The electronic-device seal structure as claimed in  claim 7 , wherein
 each of the pair of terminals is a laminate configured by folding and superimposing a plate-like member. 
 
     
     
       9. The electronic-device seal structure as claimed in  claim 7 , wherein
 the second clearance between the pair of terminals is not larger than 0.5 mm. 
 
     
     
       10. An electronic-device seal structure, comprising:
 a base; 
 a case which covers an upper surface of the base and has an opening at a surface thereof; and 
 a terminal, which is attached to the base, having a body and a pair of terminal parts at one end of the body, wherein 
 a sealing material is disposed between the base and the case, sealing the case and the base together, 
 a clearance is provided between the pair of terminal parts disposed on an end surface of the base to face each other and is surrounded by the pair of terminal parts, the body of the terminal, and the case, 
 the clearance is disposed on the body of the terminal, 
 clearance forming portions, which form the clearance and are provided on bases of the pair of terminal parts to face each other, 
 a dimension from the body of each of the pair of terminal parts to an inner surface of the case is not smaller than 0.16 mm and not larger than 0.25 mm, 
 the clearance between the clearance forming portions is not larger than 2.0 mm, and 
 a longitudinal dimension of a facing portion of each of the clearance forming portions is not larger than 2.1 mm, and the sealing material has a viscosity of 39000 to 48000 mPa s in a range of 25±5° C. 
 
     
     
       11. The electronic-device seal structure as claimed in  claim 10 , wherein
 each of the pair of terminal parts is a laminate configured by folding and superimposing a plate-like member. 
 
     
     
       12. The electronic-device seal structure as claimed in  claim 10 , wherein
 the clearance between the pair of terminal parts is not larger than 0.5 mm.